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I.R. Study of Alkyl-Ammonium Vermiculite Complexes

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Clays and Clay Minerals

Abstract

Two octyl-ammonium vermiculite complexes with different 001 periodicities have been studied by i.r. spectroscopy. In each case i.r. spectroscopy affords information on the orientation of the — NH3+ groups and the strength of the hydrogen bond between these groups and the silicate oxygen surfaces. Also a perturbation of the vibration of the OH groups of the silicate has been observed that seems to be related to the distance from the center of the layer at which the — NH3+ groups are situated.

The i.r. results are discussed in relation to the structural models deduced from X-ray analysis.

Résumé

Deux complexes de vermiculute octyl-ammonium avec différentes pàriodicités de 001, ont été étudiés par la spectroscopie à l’infra-rouge. Dans chaque cas, la spectroscopie à l’infra-rouge fournit des renseignements sur l’orientation des groupes —NH3+ et la force du lien d’hydrogøne entre ces groupes et les surfaces d’oxygøne silicate. On a également observà une perturvation des groupes OH du silicate qui semble ðre en rapport avec la distance du centre du feuillet, à l’endroit où se trouvent les groupes —NH3+.

Les résultats infara-rouge sent discutés en fonction des modøles structuraux dàduits de l’analyse aux rayons X.

Kurzreferat

Zwei Oktyl-Ammonium Vermiculit Komplexe mit verschiedenen 001 Periodizitäten wurden durch Infrarot Spektroskopie untersucht. In jedem Falle liefert die Infrarot Spektroskopie Auskunft über die Orientierung der —NH3+ Gruppen und die Stärke der Wasserstoffbindung zwischen diesen Gruppen und den Silikat Sauerstoff Oberflächen. Ferner wurde eine Störung der Vibration der OH Gruppen des Silikates beobachtet, die mit der Entfernung vom Mittelpunkt der Schicht an welcher sich die —NH3+ Gruppen befinden, zusammen zu hängen scheint.

Die Infrarot Ergebnisse werden im Zusammenhang mit den aus der Röntgenanalyse abgeleiteten Strukturmodellen erörtert.

Резюме

Методом инфракрасной спектроскопии изучены два октил-аммониевых комплекса вермикулита с различной периодичностью в направлении 001. Для каждого случая этот метод позволил получить информацию об ориентации групп NH3+ и интенсивности водородных связей между этими группами и кислородными поверхностями слоев. Кроме того наблюдались нарушения вибраций групп OH силиката, которые, очевидно, связаны с расстояниями, на которые группы NH5+ удалены от центров слоев.

Результаты ИКС—исследований обсуждаютсяс точкизренияструктурныхмоделей, полученных с помощью рентгеновского анализа.

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Serratosa, J.M., Johns, W.D. & Shimoyama, A. I.R. Study of Alkyl-Ammonium Vermiculite Complexes. Clays Clay Miner. 18, 107–113 (1970). https://doi.org/10.1346/CCMN.1970.0180206

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  • DOI: https://doi.org/10.1346/CCMN.1970.0180206

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